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I am 100% certain it is detonation, and under the aforementioned conditions, it is quite pronounced and unmistakable.
As I would like to flash the ecu soon, my dilemma is such: should I take it to the dealer before flashing the ecu? Or try a flash that has a modified Transient Ignition Retard Table, IF there is such a flash available.
And aside from detonation at the aforementioned conditions, I haven't heard it happening any other time.
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